Fastening-driving mechanism



(No Model.

W. SHAW.

FASTENING DRIVING MECHANISM. No. 591,790. Patented Oct.12, 1897.

WITNESSES: IIVVE 70/? W By A W wmw ATTORNEYS.

UNITED STATES PATENT OFFICE.

IVALTER SHAW, OF BOSTON, MASSACHUSETTS, ASSIGNQR TO THE CONTI- NENTAL LASTING MACHINE COMPANY, OF MAINE.

FASTENING-DRIVING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 591,790, dated October 12, 1897- Applicationfiled April 25, 1896. Serial No. 589,072. (No model.)

To aZZ whom it may concern:

Be it known that I, WALTER SHAW, of Boston, in the county of Sufiolk and State of Massachusetts, have invented an Improved Fastening-Driving Mechanism, of which the following is a specification, reference being had to the accompanying drawings,in which Figure 1 is an elevation of a fasteningdriving machine embodying my invention. Fig. 2 is a detail of the automatic slow-motion feed. Fig. 3 shows the rock-shaftfi, looking in the direction of the arrow. Fig. 4 is a detail of the slide and pawl shown in'Fig. 2, looking from the right of Fig. 2.

The main feature of my invention is the combination of fastening-driving mechanism with. feed mechanism whereby the driver makes several strokes while the feed mechanism is feeding one fastening, the object being to drive a single fastening in a small fraction of a second and yet to allow an interval of time between the consecutive driving of fastenings sufficient to allow the operator to move the work.

A second feature of my invention is the combination, with such a fastening-driving machine as above described, of anappliance under the control of the operator by which he can cause a fastening to be driven whenever required.

The details of construction of a tack-driving machine such as is illustrated in the drawings are too well known to require extended description, being shown and described in Letters Patent No. 555,595, dated March 3, 1896, and No. 473,136, dated April 19, 1892, granted to Erastus Woodward.

In the drawings, A is the standard, upon the upper end of which are mounted the driver mechanism, the receptacle for the tacks, and the chute through which the tacks are conveyed.

Bis the main driving-shaft, driven through the pulley b from any source of power.

D is the feed mechanism driving-shaft.

Mounted upon the shaft B is an eccentric b, which operates two pawls continuously, and when the relation between the pawls and the teeth of their ratchet allows it the shaft D is partially revolved, and at each complete movement of the shaft D a fastener is fed by the feed mechanism, all substantially as shown in Patent No. 47 3,136, above referred to, and as will be clear without further description. Rod H, having a' pawl h at its upper end to engage ratchet 61 is supported by a spring h, which tends constantly to throw rod H .up, the upward motion being limited by stop h adjustable by means of screw 77, Upon rod H are ratchet-teethj, and sliding upon the toothed rack of rod H is a pawlshield J, connected to lever F. Shaft B carries a worm 12 which meshes with a wormgear 6 running in hearings on and carrying cams 6 These cams engage a cam-surface upon lever j (which is pivoted at one end to the frame of the machine) and move it up, the motion being transmitted through con.- necting-lever 7' arm 7' rock-shaftj and arm j to slide 70, which carries pawl j.

The operation is as follows: To set the feed mechanism in motion, the lever F is depressd, with the result that the pawl-shield J is drawn down, exposing the ratchet-teethj upon the rod H. The pawl j, carried in slide is, which is reciprocated by the movement of arm 7 thereupon engages the ratchet j and forces rod H down against the force of spring h, which draws the rod H up as soon as the pawl makes its upward stroke. In this way regular reciprocating motion will be imparted to the rod H, while lever F is depressed, and the feed-shaft D will be moved by the rod H and pawl h as it reciprocates, and the feed movement of shaft D will be completed, as described in Patent No. 473,136, above referred to. To enable the operator to get afastener immediately upon depressing lever F,I use the connecting-rod E, which is attached to lever F and consequently moves shaft D, by means of its pawl e and ratchet (1 when the lever F is depressed, as fully described in Patent No. 555,595, above referred to. p

The characteristic features of my invention will be plain when it is considered that so long as the pawl-shield J is out of operation the tack-feed is operating to feed one tack for every fourteen strokes of the driver, (if each cam 12 requires fourteen revolutions of shaft B to cause it to operate pawl j",) and the operator will thereby be enabled to move the work (held usually on a power-raised jack,

as in the patents above referred to) under the nozzle of the machine after the tack-feed'has fed one tack before it feeds the next tack, and yet he can get a tack almost instantaneously by simply moving pawl e. If the driver makes twenty strokes per second, the operator can get a tack as soon as he depresses treadle G or otherwise moves pawl e, and he will get tacks at intervals of about half a second, so long as he keeps the treadle G depressed or otherwise keeps pawl j in operation. The last of these features is wholly new with me and of great practical value in lasting, and while the first of these features is shown in Patent No. 555,595, yet the combination of both features is wholly new with me. I

While either feature may be used without the other, as will be plain, yet a tacker with an automatic slow-motion feed is a new type of machine, and that type of machine is greatly improved by providing it with means to feed a tack by the act of the operator.

In brief, the main'feature of my invention ism and a supplementary feed-starting mechanism, all organized and operating substantially as described. I

\VALTER SHAW.

\Vitnesses:

JOHN R. SNOW, WM. HAYNADIER. 

